Placenta previa, premature rupture of fetal membrane (PROM), multiple pregnancy and maternal chronic hypertension are the main rlated factors of premature delivery;
新生儿窒息的危险因素有胎儿宫内发育迟缓，母亲孕期并发妊高征和胎儿窘迫。
Placenta previa, premature rupture of fetal membrane (PROM), multiple pregnancy and maternal chronic hypertension are the main rlated factors of premature delivery;
新生儿窒息的危险因素有胎儿宫内发育迟缓，母亲孕期并发妊高征和胎儿窘迫。
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